Damper control



Nov. 20, 1928. 1,692,465

o. PETERSEN DAMPER CONTROL Filed vApril 17, 1924 PafentedNov. 2o, 192s.1,692,465

UNITED STAT-ES PATENT OFFICE.

OSCAR PETERSEN, OF CHICAGO, ILLINOIS, ASSIGNOR T MILLS NOVELTY`COMPANY,OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS;

DAMPER CONTROL.

Applicatlon filed April 17, 1924. Serial No. 707,113. i

This invention relates to damper control tains the lever in thisposition until the elecmechanism for usefin player pianos and thetro-magnet 23 is actuated, thereby releasing like and is full describedin the following the lever 16 and permitting it to return to 5ospecification an shown in the accompanying its normal position wherebythe damper is 6 drawing in which the figure is a partial end again incontact with its strings. Felt 23a elevation of a player action showingthe conis placed on the end of the electro-magnet 23 trol magnets forthe dempers. which serves to deaden the sound and also The device asillustrated is adapted to be assists in releasing the armature 22 whenthe 55 used on a player piano or the like. of the type electro-magnet 23is de-energized. l0 shown and described in the patent to Henry While Ihave shown and described certain K. Sandell, No. 1,603,871, grantedOctober' embodiments of my invention, it is to be. 19, 1926, andcomprises a frame 10 adapted understoodk that it is capable oitl manymodito be secured to the string plate 11 of a piano, ications. Changestherefore in the construceo and on which is mounted an electro-magnettion and arrangement may be made without 15 12 having a horizontallymovable core 13 of departing from the spirit and scope or' the ksoftiron or the like. invention as disclosed in the appended claims,

A link 14 is pivotally Connected at one end in which it is my intentionto claim all novto the core 13 by means of a pin 15 and at elty inherentin my invention as broadly as 65 the opposite end to the lower end ofthe lever possible in view ot' the prior art. 16 by means of a pin 17.This lever is pivot- I claim:

ally mounted at its upper end and as it moves -1. In a stringedinstrument,a damper conback and forth operates the'damper mechtrollever, means for moving said lever to anism (not shown) in the same wayas in the apply the damper, a latching-pawl having a 7o above-mentionedpatent to Sandell. shoulder adapted to engage a member on said A paw] 18pivotally mounted at 1'9 has a lever and hold the lever in dampingposition, shoulder 20 adapted toy drop behind the pin and anelectro-magnet for lifting said paw] 21 on the level' 16, which ispreferably covto release said lever. ered with felt. These parts are sorelated 2. In a stringed instrument, a damper-ap- 75 that the pawl 18drops behindthe pin 21 plying lever, an electromagnet serving to whenthe lever 16 is drawn back by the elecmove said lever to apply thedamper, a pivytro-magnet 12 to the position shown. oted latching-leveradapted to automatically rThe pawl 18 has an arm 22.which serves latchsaid first-named lever' in damping. posias an armature for theelectro-magnet 23. tion after the 'damper has been applied, and a soWhen this electro-magnet is energized, the second electro-magnet adaptedto retract said pawl 18 is retracted and the lever 16 is movedlatching-lever. i

as by gravity, toward the electro-magnet 12, 3. In means of thecharacter set forth, a the lower edge 188L of the pawL 18 resting upondamper-actuating lever provided with a the pin 21. c Ylatching-shoulder, an electromagnet having 85 Thus it will be seen thatwiththe parts in a. core linked to said lever and serving to senormalposition. the lever 16 and core 13 are cure it to the damping position,a pivoted retracted and the edge 18a of the pawl 18 latching-'pawloperative to engage said rests upon the pin 21, and the damper (notshoulder and releasably hold said first-named shown) is in contact withthe string. Enerlever in damping position, and a second 90 gizing theelectro-magnet 12 draws the core electro-magnet adapted to retract saidlatch- 13 to the left, forcing the lever to the posiing-lever. tionillustrated and raisingy the damper. The pawl 18 then drops behind thepin 21k and re- OSCAR PETERSEN.

